# Relationship history for MSHA mine 2003310

Current hierarchy: **Edward C  Levy Jr → American Aggregates of Michigan Inc → Pleasant Lake Aggregates**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Edward C  Levy Jr et al → Pleasant Lake Aggregates; 1997-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Aggregates of Michigan Inc → Pleasant Lake Aggregates; 2004-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward C  Levy Jr et al → American Aggregates of Michigan Inc; 2004-12-01 to current/open; source msha-controller-operator-history